MP4 video from Telegram has double link

Take a look [at this Telegram message](https://t.me/codingteam/598630): for some reason, the content link was duplicated in XMPP:
```
[19:03:29] тг: <@fvnever> [Animation]: https://fornever.me/emulsion/ct/content/qDS0S01
https://fornever.me/emulsion/ct/content/qDS0S01
```